Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
lang ha » long ha
va hanh » van hanh, va thanh, va danh
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
loc va » hoc va, luc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach y lang ha hoi. hieu ((((va bai) or (te tai))) or (ve cac)) loc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y lang ha hoi. hieu ((((va bai) OR (te tai))) OR (ve cac)) loc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: co sach y lang ha hoi. hieu ((((va bai) or (te tai))) or (ve cac)) loc va hanh vi cua vat*.